Wyniki wyszukiwania - BazTech

1

Understanding the collection behavior of gangue minerals in fine flake graphite flotation

Xu Wenlu, Sun Kangkang, Qiu Yangshuai, Zhang Lingyan, Yang Luo, Wei Shaowei, Ding Dafa

Physicochemical Problems of Mineral Processing

|

2022

|

Vol. 58, iss. 1

101--112

EN

Flotation is one of the most common and effective methods for the beneficiation of natural graphite resources. However, the upgrading efficiency of flotation is always finite due to the undesirable collection of gangue minerals. In this work, the collecting mechanism of three typical gangue minerals, including mica, quartz, and feldspar, in fine flake graphite flotation was investigated. Results of batch flotation tests for single-minerals and artificial mixtures confirmed the enhanced collection of gangues in the presence of graphite particles. Contact angle and zeta potential results and theoretical calculations of the interaction between graphite and gangue particles based on typical DLVO theory indicated that it is impossible to collect gangue minerals by true flotation or through heterocoagulation with graphite particles. The fitting results of accumulated gangue recoveries and accumulated water recoveries using the Warren method demonstrated that most gangue minerals entered the concentrate through entrainment, with a small proportion by bubble inclusions.

2

Effect of calcite and mica contents in nepheline syenite samples on the ceramic body sintering behaviours and surface roughness

Durgut Emrah, Cinar Mustafa, Ozdemir Orhan

Physicochemical Problems of Mineral Processing

|

2022

|

Vol. 58, iss. 5

art. no. 149179

EN

In this study, the effects of calcite and mica contents in nepheline syenite (NS) samples beneficiated by high intensity dry magnetic separation and flotation methods on ceramic bodies were investigated in detail. The NS samples were, first, sintered to observe the physical and surface roughness properties, and characterized based on the change of NS samples such as color, shrinkage, water absorption, and surface roughness after the sintering process. L-a-b color and Ra, Rz, Rt values for the NS samples were determined. The decrease in calcite and mica contents affected the surface of sintered specimens positively by reducing roughness values. Additionally, the water absorption values were found to be directly proportional to Ra values for unglazed surfaces. In conclusion, calcite and mica minerals in NS samples negatively affected surface quality by forming pinholes due to dehydroxylation and outgassing reactions in the sintering process.

3

Influence of dynamic adsorption layer formation on bubble attachment to quartz and mica surfaces in solutions of pure and mixed surface-active substances

Wiertel-Pochopień A., Zawala J.

Physicochemical Problems of Mineral Processing

|

2018

|

Vol. 54, iss. 4

1083--1094

EN

The paper presents systematic studies on influence of state of dynamic adsorption layer (DAL) induced at the rising bubble interface on time-scale of the bubble attachment to quartz and mica surfaces immersed in pure n-cetyl-trimethylammonium bromide (CTAB) and mixed octanol/CTAB solutions of different concentrations. It was found that in the case of pure CTAB solutions, the influence of DAL on time of bubble attachment and the three-phase contact (TPC) formation (tTPC) strongly depends on solution concentration. Generally, two solution concentration regimes were distinguished – low and high - for which different degree of solid surfaces hydrophobization was observed. It was determined that for low concentration regime the solid surface is only slightly hydrophobized while for high regime, hydrophobicity of the solid surface is much higher. Consequently, wetting film rupture for low concentration regime is governed by electrostatic interactions while for high concentration regime significance of these interactions is much smaller. As a result, the DAL influenced the film rupture in these two regimes in a quite different manner. For mixed n-octanol/CTAB solutions it was found that CTAB molecules presence is necessary condition for wetting film destabilization. Moreover, thanks to the developed approach, allowing control of initial adsorption coverage over the bubble surface (independently on concentration), it was proved that constant adsorption degree of CTAB molecules at the bubble surface in the mixture, leads to identical times of the TPC formation.

4

Water contact angle on corresponding surfaces of freshly fractured fluorite, calcite and mica

Kowalczuk P. B., Akkaya C., Ergun M., Janicki M., Sahbaz O., Drzymala J.

Physicochemical Problems of Mineral Processing

|

2017

|

Vol. 53, iss. 1

192--201

EN

Advancing and receding contact angles of water with corresponding surfaces of freshly fractured calcite, fluorite and mica were measured. The corresponding surfaces were obtained by mechanical splitting of a small lump of each mineral into two pieces. Theoretical considerations revealed that depending on the mineral cleaving plane, surfaces created by splitting into halves can be either identical or entirely different as far as their surface chemical composition is concerned. It was experimentally established that receding and advancing contact angles measured on the corresponding surfaces of fluorite, calcite and mica were identical for the sessile drop method. When the contact angle was measured by the captive bubble approach, there were small differences in the contact angles measured on the corresponding surfaces of fluorite. It was most probably due to surface irregularities and roughness, and therefore different times needed to rupture the liquid film between the bubble and solid surface.

5

Use of Pinched Sluice in Albite Concentration

Polat E., Aksoy A. A., Bozkaya A., Tunc S., Kucukler M., Guler T.

Inżynieria Mineralna

|

2017

|

R. 18, nr 1

33--38

EN

Albite (NaAlSi3O8) is an important industrial mineral especially for ceramic and glass production. Major Fe-containing impurity of albite ore is flaky mica minerals. This study was conducted to determine the applicability of pinched sluicing for pre-concentration of albite ore by exploiting shape effect. Effects of feed solid rate, tilting angle of pinched sluice, and splitter position on the rejection of Fe-containing flaky mica were tested. Pulp solid rate was determined to be the most important variable on the rate of mica rejection. Increasing the tilting angle adversely affected the separation efficiency especially above 17°. Distribution of gangue mica in the vertical cross-section of flowing film was tested manipulating the splitter height. Mica particles were observed to be crowded in upper layers of film thickness. So, flaky mica impurity was thought to be separated from feldspar ore, and a pre-concentrate was obtained. All Fe-containing coloring impurities could not be removed due to different mineralogical origins of them in the ore. Optimum operating variables were determined as follows: 56% feed solid rate, 17° tilting angle of pinched sluice, and splitter height lower or closer to 2/3 of the total pulp film thickness. Pulp solid rate of underflow stream almost linearly changed with respect to splitter height.

PL

Albit (NaAlSi3O8) jest ważnym surowcem przemysłowym, szczególnie w ceramice i produkcji szkła. Najważniejszymi zanieczyszczeniami żelazowymi występującymi w albicie jest łuskowata mika. Celem badan było określenie możliwości wykorzystania wzbogacalnika poziomo-prądowego do wstępnego wzbogacania albitu z wykorzystaniem analizy kształtu. Badano wpływ natężenia przepływu nadawy, zawartości fazy stałej, geometrii strugi nadawy na efekt wydzielenia miki zawierającej zanieczyszczenia minerałami żelaza. Zawartość fazy stałej w nadawie została określona jako najważniejszy czynnik wpływający na efektywność procesu. Zwiększenie kąta nachylenia komory roboczej niekorzystnie wpływało na separację, szczególnie powyżej 17°. Badano wpływ rozdział miki w przekroju poprzecznym strumienia nadawy. Ziarna miki koncentrowały się w górnych warstwach strumienia. Stwierdzono, że drobne ziarna miki oddzielają się od rudy skaleniowej i można otrzymać prekoncentrat. Z uwagi na sposób występowania zanieczyszczeń nie można wydzielić wszystkich zanieczyszczeń barwiących. Określono optymalne parametry procesu: zawartość fazy stałej w nadawie 56%, kąt nachylenia rynny podawczej 17°, a wysokość rozdzielacza strugi niższa od 2/3 całkowitej grubości warstwy materiału.

6

Investigation of quartz flotation from decarburized vanadium bearing coal

Ren L., Zhang Y., Bian Y., Liu X., Liu C.

Physicochemical Problems of Mineral Processing

|

2015

|

Vol. 51, iss. 2

755--767

EN

Ether diamine (Fm 2835-2L) was used as a collector for flotation of quartz. It allows flotation of quartz from mica and calcite. The adsorption mechanism of Fm 2835-2L on quartz was investigated by flotation tests, zeta-potential measurements and infra-red (FTIR) spectra measurements. Results show that Fm 2835-2L adsorbs on the quartz surface in physical adsorption with no new products, changing its zeta potentials, and increasing its hydrophobicity. The effect of calcium ions on flotation of quartz was investigated by flotation tests and zeta-potential measurements. Results show that under neutral or weakly acidic conditions calcium cation can adsorb onto the surfaces of quartz, increase the zeta potential of quartz particles, which in turn causes weaker aggregation of quartz particles and lower flotation recovery of quartz. Under the alkaline conditions the hydrolytic components of calcium are also adsorbed on the quartz surface and increase the zeta potential of quartz particles, which causes stronger aggregation of quartz particles and higher flotation recovery of quartz. However, the hydrolytic components such as CaOH+, Ca(OH)2(aq) and Ca(OH)2(s) were not formed in significant amounts in the best flotation tests.

7

Metasomatic column with the apobasite listvenites end-member from the Slovinky-Gelnica ore field (Gemeric Superunit, Western Carpathians) and comparison to their type localities from Ural

Simurkova M.

Geology, Geophysics and Environment

|

2015

|

Vol. 41, no. 1

132--133

EN

A metasomatic column (or metasomatic zone pattern) is the complete sequence of metasomatic zones characterising an individual metasomatic facies (Zharikov et al. 2007). The genesis of this column is the result of a series of processes, in the case of basic rock protolith leading to the formation of apobasite listvenites (in the sense of Sazonov 1975). It includes three partial processes: 1) carbonatization, 2) silicification and 3) formation of mica (e.g. Plissart et al. 2009) involving the infiltration of a CO2-rich fluids and shows similarity to processes of listvenitisation (e.g. Clayton 1993). Field research in Slovinky-Gelnica ore field has revealed the presence of such a metasomatic column (cf. Ivan 1987). It comprises metabasites as the protolith, carbonatised metabasites, listvenite-type metasomatites and listvenites s.s. The metabasites have features of subvolcanic rock types (Ivan 2009), what makes them comparable with similar rocks from Ural. The petrographic study of selected samples has showed that amphibole, chlorite and albite became progressively unstable in this sequence of alterations, replaced by carbonate, silica and lastly by the muscovite minerals, sericite or fuchsite (Ivan 1987). Carbonates change their quantity as well as mineralogical composition with the development of the column in two trends of changes: towards Mg-Fe carbonates or Mg-Ca carbonates. Regarding the samples from Ural, Fe-dolomites and ankerites predominate, the metasomatic columns derived from gabbros and dolerites are essentially the same. The geochemical study of rock samples from the study area (22 whole rock analyses) as well as the comparison with similarly metasomatised rock series from Ural (56 analyses) allowed as to give more detailed characterization of the metasomatic column. The most obvious change is a clear increase of K with decreasing Na as a sign of the albite break-up and Krich minerals (such as muscovite) formation. The increase of LOI and CO2 indicate the process of carbonatisation. Listvenitisation is often associated with the hydrothermal ore veins formation and the rare metal mineralization with concentration of elements such as Au, Co, Sb, Cu, Ni (e.g. Dinel et al. 2008, Buckman & Ashley 2010). This could be significant as regards the genesis of stratiform ore deposits within the Slovinky-Gelnica ore field.

8

The role of particle size and solid contents of feed on mica-feldspar separation in gravity concentration

Kademli M., Gulsoy O. Y.

Physicochemical Problems of Mineral Processing

|

2012

|

Vol. 48, iss. 2

645-654

EN

In the present study, the role of particle size of mica with flaky shape on the separation efficiency of mica from feldspar by the shaking table and Reichert spiral (Model HG7) concentrators were investigated. An albite ore containing mica from the Cine region of Turkey was treated under various test conditions. During the study, particle size distribution, solids content of the feed and flow rate of the feed were changed in the spiral tests. Then, the flow rate of the feed was kept constant as 1 dm3/s in the shaking table tests. It was observed that mica could be separated from feldspar, owing to its laminar morphology. Accordingly, the particle size, directly related to the laminar morphology of mica, is the most effective parameter in the separation process. The best results were obtained with spiral concentrators, which met the requirements of the glass industry.

9

Characterization of granites by 57Fe Mössbauer spectroscopy

Hassan K. M.

Mineralogia

|

2009

|

Vol. 40, iss. 1/4

95--106

EN

Two granite complexes in Egypt, a sodic type and an aluminous type are characterized by Mössbauer spectroscopy. Mössbauer spectra (MS) of the sodic granite show a major doublet of ferric (Fe3+) iron that is attributable to octahedral coordination (M1) sites plus/minus a tetrahedron Fe3+ doublet plus/minus a doublet of ferrous (Fe2+) iron on the M1 sites plus/ minus another Fe2+ (M1) doublet and a sextet of Fe3+. The sextet is attributed to -Fe2O3 (hematite) and the other Fe components are due to NaCaFeSi2O6 (aegirine-augite) plus/minus minor contributions from (Ca2(Mg,Fe)5(Si,Al)8O22(OH)2 (magnesium-hornblende). Changes in the quadrupole splitting and width line of Fe2+ ions are likely composition-related. The MS of the aluminous-type granite, on the other hand, shows evidence only of single doublets containing Fe2+ or Fe3+ in the octahedral M1 sites, with parameters that remain almost constant. This consistency implies that the existing minerals – K(Mg,Fe2+)3 (Al,Fe3+)Si3O10(OH,F)2 (biotite), (Mg,Fe)6(Si,Al)4O10(OH)8 (clinochlore), (Na,K)Ca2(Fe,Mg)5(Al,Si)8O22(OH)2 (ferrohornblende and magnesiohornblende) – have similar iron positions. The intensity of iron oxidized (Fe3+/Fe) for the sodic granite is 79.1 to 100% and for the aluminous granite, 28.4 to 38.2%. The observed Fe3+/Fe differences between the two granites are source- -related and consistent with distributions of other redox-sensitive elements.

10

Modeling the undrained response of a sand with addition of mica particles using stepwise regression

Cabalar A.F.

Architecture Civil Engineering Environment

|

2009

|

Vol. 2, no. 1

43-48

EN

This study presents an experimental work on coarse rotund sand - mica mixture and availability of a stepwise regression (SR) method for the results formulation. The experimental database used for SR modelling is based on a laboratory study of saturated coarse rotund sand and mica mixtures with various mix ratios under a 100 kPa effective stresses. In the tests, deviatoric stress (q), pore water pressure generation (u), and strain levels have been measured in a 100 mm diameter conventional triaxial testing apparatus. The input variables in the developed SR models are the mica content, and strain, and the outputs are deviatoric stress, pore water pressure generation, and undrained Young’s modulus. The performance of accuracies of proposed SR models are quite satisfactory. The proposed SR models are presented as simple explicit mathematical functions for further use by researchers.

PL

Artykuł przedstawia badania doświadczalne prowadzone dla mieszaniny gruboziarnistego okrągłego piasku i miki oraz możliwości metody regresji krokowej (SR) dla wyrażenia za pomocą wzoru wyników badań. Dane doświadczalne zastosowane w modelowaniu regresji krokowej SR są oparte na studium laboratoryjnym nasyconych mieszanin gruboziarnistego okrągłego piasku i miki dla zmiennych proporcji mieszanin poddanych efektywnym naprężeniom równym 100 kPa. Podczas badań w konwencjonalnym aparacie trójosiowego ściskania dla próbek o średnicy 100 mm, dokonuje się pomiarów dewiatora naprężenia (q), wytworzonego ciśnienia wody w porach (u) oraz poziomu odkształcenia. Danymi wejściowymi w rozwijanych modelach regresji krokowej SR są: zawartość miki, odkształcenie; natomiast danymi wynikowymi są: dewiator naprężenia, wytworzone ciśnienie wody w porach oraz niedrenowany moduł Younga. Osiągniętą dokładność proponowanych modeli regresji krokowych uważa się za dość satysfakcjonującą. Proponowane modele regresji krokowej są przedstawione w prostych ustalonych funkcjach matematycznych w celu zastosowania ich w przyszłości przez naukowców.

11

Zastosowanie minerałów łyszczykowych w elektrotechnice

Krzemień Z.

Nowa Elektrotechnika

|

2008

|

nr 7-8 (47-48)

34--36

12

Ekologiczne pigmenty nośnikowe na bazie łyszczyków.

Żygadło M., Dziubak C.

Szkło i Ceramika

|

2007

|

R. 58, nr 4

18-22

PL

Minerały łyszczykowe (miki), dzięki specyficznym właściwościom wynikającym z budowy strukturalnej są szeroko wykorzystywane w zastosowaniach praktycznych: w kondensatorach, filtrach optycznych, izolatorach, adsorbentach, betonach i pigmentach tzw. nośnikowych. Pigmenty nośnikowe stanowią środki barwiące, zbudowane z podłoża - nośnika, najczęściej mineralnego, na który nakładane są warstwy nieorganiczne składające się z materiałów o różnych gęstościach optycznych. To powoduje występowanie zjawisk interferencji, które nadają pigmentom swoiste barwy, perłowy połysk i brylantowy wygląd. Swoiste zabarwienie i połysk pigmentów pochodzi: od wielowarstwowej struktury nieorganicznego nośnika i chromoforu i zależy od rodzaju, wzajemnego położenia tych warstw i ich grubości na bazowym krysztale łyszczyku. W obrębie tej struktury, wielokrotne odbicie padającego światła powoduje efekt barwny zmienny, odpowiednio do kąta obserwacji. Blaszkowy pokrój łyszczyków, równoległe ułożenie płatków pigmentu w medium wzmacnia efekt interferencji światła odbitego. Ważną cechą pigmentów jest ich nietoksyczność wynikająca z mineralnego ekologicznego podłoża i znikomej zawartości składników chromoforowych.

EN

The mica-type minerals due to their specific properties resulting from the structure have many practical applications in condensers, optical filters, electrical insulators, adsorbents, concrete and so-called carrier pigments. The carrier pigments are colorizing agents consisted of a support - carrier, mostly the mineral one, on which inorganic layers of various optical densities are applied. This structure leads to the phenomena of interference, which gives to pigments specific colour, a pearl shinning and diamond appearance. These pigments properties can be modified by mutual sequence of layers and their thickness on the mica carrier. Within this multilayer structure the multiple light reflection causes a variable colour effect depending on the observation angle. The plate-like mica structure and the parallel stacking of pigment flakes reinforces interference. An important property of pigments is their non-toxicity as a result of mineral ecological carrier and very small content of chromophores.

13

Uwagi na temat stosowania miki jako wypełniacza

Tomanek H.

Przetwórstwo Tworzyw

|

1998

|

nr 9

207-209